Product market fit is generally achieved when you can’t keep up with demand for your product. “Can’t keep up” is generally an operational problem first, then a technical problem (the Do Things That Don’t Scale stuff catches up to you basically).
Scaling is a GOOD problem…as long as you actually have a business model. If you’re selling stuff but getting crunched by demand and your tech is cracking at the seams…hell yes! Pay people to fix the tech/replace the janky or slow stuff/automate manual things.
If you don’t have a business model, you can scale the shit out of some idea but not be able to afford to fix the issues coming from breaking out of your frameworks. Not to say you can’t eventually make this model work, you just have to raise a shit ton of money to do it usually.
Use frameworks. It’s not a debate. Don’t reinvent wheels when you’re trying to invent some new product idea.
Only work on the product.